fix(magic env) HEX secrets creating double the length of their name

[yipfram]

Changes

• Divided Str::random

Issues

Fixed SERVICE_HEX_64 or 32 or 128 generating double their size name

SERVICE_HEX_64 would create a 128-character chain, 32=>64 and 128=>256

Because hex = 2 characters when converting.

• Fixes

Category

• Bug fix
• Improvement
• New feature
• Adding new one click service
• Fixing or updating existing one click service

Preview

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Testing

I could not test it in local environment for coolify, i can't get it to run.
I did test by using SERVICE_HEX_32 to generate a 64 character secret, it works.

Contributor Agreement

Important

• I have read and understood the contributor guidelines. If I have failed to follow any guideline, I understand that this PR may be closed without review.
• I have searched existing issues and pull requests (including closed ones) to ensure this isn't a duplicate.
• I have tested all the changes thoroughly with a local development instance of Coolify and I am confident that they will work as expected when a maintainer tests them.

[Copilot]

Pull request overview

Fixes the generated length of SERVICE_HEX_* magic environment variables so the produced hex string matches the size indicated by the suffix (e.g., _64 => 64 hex chars), rather than being doubled.

Changes:

• Adjust HEX_32, HEX_64, and HEX_128 generation to use half-length inputs before bin2hex(), producing the intended output length.

[Copilot]

bin2hex(Str::random(...)) hex-encodes an alphanumeric string (ASCII bytes), not raw random bytes, which reduces entropy and produces a biased hex distribution. For cryptographic secrets, generate bytes with random_bytes() (or an equivalent crypto-safe byte generator) and then bin2hex() those bytes, keeping the requested output length consistent (e.g., 32 hex chars => 16 bytes).

[Copilot]

There are no unit tests asserting the output lengths for the HEX_* magic variables, and this change alters those lengths. Add/extend a unit test that calls the env-generation path and verifies that HEX_32/64/128 produce exactly 32/64/128 hex characters (and valid hex).